Victorian gold filled book chain sardonyx cameo necklace. The necklace measures 18 1/2" long. The embossed book chain measures 1/4" wide. The tongue in groove clasp is hidden in the center plaque. The center plaque has black tracery enamel. The end book chain link that is connected to the tongue in groove clasp has much wearing off of the gold plating, otherwise this piece is in good condition.